Door-bolt



C. HOFFMAN.

DOOR BOLT.

` APPLICATION FAILED JULY 16| |920. 1,388,712,v Patented Aug. 23, 1921.

UNITED STATES PATENT oFFlcE.

Doon-Bom.

Specification of `Letters Patent.

`Pzttellted Allg'. 23, 1921.

Application filed July 16, `1920. Serial No. 396,696.

To all whom t may conce/m.'

Be it known that I, CARL HOFFMAN, of Allentown, in the county ofIieliigh and State ot Pennsylvania, have invented certain new and usefulImprovements in Door- Bolts; and I do hereby declare the following to bea full, clear, and exact description et the invention, such aswillenable others skilled in the art to which itappertains to' make anduse the same.

My invention relates to locking devices tor doors and more particularlyto such as are adapted tor locking the door in its fully closed positionas well as in a partially opened position.

The object oi' my invention is to provide an improved, simple, andhighly efficient lock oi this character embodying but few parts whichwill not readily get out o1 order, the coperating parts of the locksbeing so arranged that they may not be easily tampered with.

In the drawings, Figure l is a view in perspective showing' my improvedlock in the position it occupies in locking the door in tully closedposition, a portion ot a door and its casing being shown. Fig. .2 is across sect. nal view of a portion of' a door and its casing with thelocking bolt in position where the door may be partly opened, Fig'.` 23is a view similar' to Fig. 2 with the door locked in a slightly openedposition. Fig. 4l a bot-tom plan view ot the bolt and auxiliary keeper,showing the catch fo r preventing turningl of the bolt.

At 'l I have indicated a casing which includes a slideway for a bolt 2having at one end a manipulating handle At its opposite end the bolt hasa lateral projecting' stud d which when the bolt is turned axially so asto bring its handle 3 in an upright position will assume a similarposition. .es shown in l the parts are in the position just describedand the extreme end 5 of the bolt is within the keeper 6 of the strikerplate. ,Extending outward trom the striker plate are a pair ofvertically alined ears 7 which form the pivotal support for an auxiliarykeeper 8. I have shown this auxiliary keeper formed from a single pieceof metal bent back upon itself, its ends being pivoted to the ears 7 andthe bowed portion 9 at its opposite end forming a stop for the bolt.Stops l0, 12, on the auxiliary keeper eooperate with the stud 4 inmaintaining the door locked in a partially opened position, a

catch 13 on the casing l being designed to be moved into engagement withthe handle 3 to prevent the bolt being' turned when the parte' are inthe position described.

In the `use of my improved door bolt, with the parts as shown in Fig. l,the door is locked in its fully closed position, and the stud l being inline with the upper ol the ears7 prevents the bolt being retracted. Itthe bolt is moved to the point where it engages the ear it will havelett the keeper G and the door may be opened, the stud ridingl along theear and then engaging the auxiliary -keeper 8. Continued opening oi thedoor will cause the keeper to turn on its pivot, the stud continuing toengage the keeper. It will. be seen that this construew tion permits thedoor to be released for slight opening, but prevents a lull opening. Themeasure ol protection afforded by such a structure is apparent. The dooris not fully released from its lock until the bolt is turned so that itsstud is freed ot the ears of the auxiliary keeper. Frequently it isdesirable to have a door slightly opened for purposes of ventilation andit is desirable that it may be locked against undue opening1 as well asagainst slamming. The auxiliary keeper is use'lul to this end. With thebolt engaging the outermost portion ot the auxiliary keeper it is turnedso that its stud ll projects downward, as indicated in Fig. d, and intoengagement with the stop '12. So turned the handle 3 is pointeddownwardly and is in a position to be engaged by the catch 13 which willprevent the bolt being turned. The stop l() will cooperate in a similarmanner as the stop l2 to prevent slamming of the door.

The advantages ot my improved lock will be apparent. It will be seen.that I have provided a positive door lock as well as a means forretaining the door in a partially locked position, and I have alsoprovided in this latter means a way by which the door may be fastenedfor ventilation purposes without the necessity ot' employing any stop atthe base of the door for contacting with the floor.

I claim as my invention:

1. A fastening device for a door including a sliding bolt, a keeper onthe door trame to receive said bolt, an auxiliary keeper also on thedoor frame and with which said bolt may be caused to engage to lock thedoor in a partly opened position, and .means in part carried by saidbolt and in part b said auxiliary keeper to maintain said bo t and saidauxiliary keeper in locked engagement, said boltl being adapted forturning movement to free it of engagement with said auxiliary keeper.

2. A fastening device for a door including a sliding and rotatable bolthaving va laterally projecting stud near one end, a keeper on the outerframe to receive said bolt, an auxiliary keeper also on thel door frameand with which said bolt may be caused to engage to lock the door in apartly opened positlon, a stop on said auxiliary keeper with Vwhich saidstud isdesigned to coperate to maintain said bolt in locking engagementwith Said auxiliary keeper, and a catch to prevent turning of said boltto disengage the said-stud and stop. Y

3. A fastening device for a door including a sliding and rotatable bolthaving a laterally projecting stud near one end and a handle at itsopposite end, a keeper on the door frame to receive said bolt to lockthe door in closed position, an auxiliary keeper also on the door frameand having a hinged connection therewith and with which said bolt may becaused to engage to lock the door in a partly opened position, stops onsaid auxiliary keeper with which said stud may be caused to engage uponturning the bolt to maintain the bo t in locking engagement with saidauxiliary keeper and a catch coperating with the handle of the bolt toprevent turning of the bolt to disengage said stu'd and stop.

In testimony whereof I have signed this specification. f

CARL HOFFMAN.

